By W. B. Crow (Auth.)
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Three disintegrate. The surviving nucleus divides again, two p r o n u c l e i being formed. One moves over to the other cell, the other remains stationary. The moving or male pronucleus fuses with the stationary or female pronucleus of the other cell (see further, under PROTOZOA) . The cells then separate. ISOGAMY The fusion of equal gametes ( i s o g a m e t e s ) . I t occurs in the uni cellular alga Chlamydomonas, in the ccenobial Gonium, the siphoneous Protosiphon, the filamentous Ulothrix, in all of which they are biflagellate and resemble small zoospores.
Sulphur g r a n u l e s occur as small shining bodies in the cells of some bacteria. CELL-WALL Is not an essential to vegetable cells ; certain spores, such as zoöspores, do not possess it. Function : (i) Mechanical s u p p o r t ; (2) Prevents undue expansion due to osmotic pressure. H hH Fig. —Cell-wall formation in a filamentous alga. Three stages shown in transverse and longitudinal views. FORM AND STRUCTURE 22 Cell-wall, continued. Protoplast == Cytoplasm + nucleus, in typical vegetable cells is expanded by such pressure to fit cell-wall closely.
Of sap to and from vessels to tissues, sugar solution through walls (translocation), of a u x i n s or growth substances through walls (how far the plasmodesms help is not known). CHAPTER V PLANTS AND ANIMALS Plants and animals differ from one another, generally, in the following points :— 1. —In plants there is a tendency to form large solid masses in which, however, there is a high proportion of surface to volume, because plants absorb their nutriment, liquid and (in land plants) gaseous, from their surface ; the plant therefore tends to expand outwards.
A Synopsis of Biology by W. B. Crow (Auth.)